Process of making calcium ferrite and phosphorus pentoxid.



S. PEAUOCK. PROCESS OF MAKING CALCIUM PERRITE AND PHOSPHORUS PENTOXID.

APPLIGATION FILED AUG. 2, 1909,

988, 1 37. Patented Mar. 28, 1911.

' wxmvto @A/ 71M V g 7 a] UNITED STATES PATENT ()FFICE.

SAMUEL PEACOCK, OF CHICAGO, ILLINOIS, ASSIGNOR 'I'O AMERICAN GYLNAMIDCOMPANY, OF NEW YORK, N. Y., A CORPORATION OI MAINE.

PROCESS OF MAKING CALCIUM FEBBITE AND PHOSPHORUS PENTOXID.

Specification of Letters Patent,

Patented Mar. 28, 1911.

Application filed August 2, 1909. Serial No. 510,932.

, following to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to a process for making iron compounds ofcalcium, and the pentoxid of phosphorus (P 0 from phosphate rock, orother cheap source of phosphate of lime and has for its object toproduce a simple and comparatively inexpensive process for making theseproducts in a single operation.

To'this end the invention consists ,in the novel steps and combinationsof steps constituting my process, more fully hereinafter disclosed andparticularly pointed out in the claims.

Referring to the accompanying drawings forming a part of thisspecification, in which the figure is a sectional diagrammatic View of awell known type of furnace suitable for carrying out my purpose, 1represents any suitable supports, 2' stationary endclosures providedwith an inlet 3 for the fuel and an exit 4: for the gases, 5 a rotatingbarrel part, 6 means for rotating the same, 7 a hopper for receiving therock mixture,-8 a screw conveyer for the same, 9 a delivery spoutleading into the furnace, while 10 represents a suitable delivery passae for the iron' compounds of calcium an 11 a suitable receptacle forreceiving the same.

For the purposes of this process crude ferric oxid or any cheap sourceof the same,

such as the well known limonite or hematite ores and phosphate of ironmay be used. Or any cheap source of lime phosphate, such as the ordinaryphosphate rock maybe used.

The followin analyses may be taken as a basis of calculation:

Ironore. Phosphate IIIIIIIIIIII a4 a The reactions involved in themanufacture of the primary calcium compounds One pound of calcium oxid(CaO) in each of the three reactions, respectively, requires Ferric oxid(FezOO; 2. 85 lbs. Alumina (A1 00 Silica .(SiO,) 1. 08

That is to say, 2,000 pounds of phosphate analyzing as above willrequire and con tain:-

Calcium oxid CaO) 900lbs. Ferricoxid F0 0,) 40 requiringli me...

Alumina (Alzoa) 60 sum 510, so u u 74 c Total lime required 72 1 lbs.

contain and require lime as follows F810] 52 lbs. requires 01 Geo 181m.o I n a I u u u I u 6 u SiO'UNZ :NIO n u u u n. 9 u

Total lline required by the iron ore 821116.

From this it is clear that since there are 779 lbs. of surplus lime(CaO) in the 2000 pounds of phosphate to react with the iron ably one ofthe type shown. to about. 1300 degrees (3., or to 1400 degrees C. whenthe iron oxid reacts with the lime phosphate.

substantially in accordance with the followmg equations The smallquantity of alumina present at the above temperature reacts sul:stant1ally in accordance with the following equation:- 1

The sili'a reacts substantially as follows The calcium salt of iron thusproduced is mixed with more or less calcium aluminates and silicates.but, the pure calcium ferriteor ferrate may be thus manufactured if pureiron and phosphates are used in the process. This calcium ferrite aswell asgthe. ferrate is founduseiul as a bond in making ore briquets, itis also used in preventing certain kinds of cements from sufferinginjuries when subjected to the action of sea water. Iron cement andalumina cements may be mentioned as instances. At the conclusions of thereactions, the calcium compounds are passed through the exit 10into'suitable re ceptacles and finished for further uses by grinding,compounding with other materials, etc. (P 0 passes out of the exit 4 andis collected in any suitable manner, as by absorption in Water. or by acondensation method.

Of course, the above PI'OPOlllOIlS are merely illustrative, and it is tobe understood that with ditterent supplies of iron 'oxids, and ofphosphates, ditt'erent proportions will obtain It is also to beunderstood that my invention is not limited to the production of monocalcium salts given as examples in the above reactions, for it isevident that 1 may produce the various acid or basic calcium saltsby,properly proportioning the particular iron oxid and phosphate beingtreated.

The pentoxid of pl'losphorus i l l i l l It is evidentthat those skilledin the art, may vary the above procedure without departing from thespirit "of the invention, and, therefore. I do not wish to be limited tothe exact disclosure. except as may be required byv the claims.

In my (o-pending application #502,793, filed June 17. 1909. l havedisclosed a process for making calcium aluminate and phosphoric acid:and in mv to-pending application #515,803. filed September 2, 1909, I

t l i l iron oxid.

have disclosed a process for making pentoxid of phosphorus, calciumsilicates and -alcium aluminates.

lVhat I claim is:

1. In the process of producing, the peatoxid ot' phosphm'us and calciumferrite from and lime phosphate, in a single which consists in mixingsaid and phosphate in such proportions thatchemically equivalentquantities of calcium oxid will be supplied to the iron oxid present inthe mixture to form calcium ferrite; and heating said mixture to atemperature insutlicient to completely fuse but sufficient to form saidferrite, and to free said pentoxid from the lime phosphates;substantially as described.

2. In the process of producing the pentoperation. iron oxid oxid ofphosphorus and calcium ferrite from iron oxid and phosphate of lime in asingle operation which consists in mixing said iron oxid and phosphatein such proportions that sufficient calcium oxid will be present in themixture to chemically react with substantially all the iron oxid; andalumina. and silica that may also be present; and heating the mixture toa temperature insutlicient to completely fuse the'mixture butsutlicient. to bring about such reactions and to free said pentoxid fromsaid phosphates; substantially as described.

3. tn the process of producing l. ,O and Ca l e th. from iron oxid andphosphate rock in a single operation which consists in suit.- ablymixing substantially 2,000 pounds of said rock. QAfi-lfipounds of ironoxid, in suitably heating the said mixture to substantially 1400 degreesC; in collecting the P 0, driven off: and in collecting, the CaFe. .Oformed: substantially as described.

In testimony whereof, I atlix my signat'urc. in presence of twowitnesses.

SAMUEL PEACOCK.

Witnesses:

LEO F. M'uarny, FRANK S. WVAsnnUnN.

